CN110635230A - Asymmetric Dual-polarized Antenna Device Based on SICL Resonant Cavity Ring Slot and Printed Vibrator - Google Patents

Abstract

The invention relates to the technical field of dual-polarized antenna manufacturing, in particular to an asymmetrical dual-polarized antenna device based on a SICL resonant cavity ring gap and a printed vibrator, which is characterized in that it is provided with a medium-integrated coaxial resonant cavity circle The annular radiation slot and the printed monopole are separated by an air gap in the vertical direction, and the two dual-polarized ports are realized by printed circuit technology, in which a dielectric integrated coaxial resonant cavity is used to load the annular slot A polarized port is formed, and a miniaturized printed rectangular monopole antenna is used as a polarized port orthogonal to it. The two polarized ports are asymmetrical, but an orthogonal radiation field is formed in space, which can generate a dipole polarized working mode, the dual-polarized antenna designed by the present invention has simple structure and low cost. The invention is suitable for occasions such as dual-polarization radars and communication systems, and has platform adaptability and wide application fields.

Description

Asymmetric dual-polarized antenna based on SICL resonant ring slot and printed dipole device

Technical field:

The invention relates to the technical field of dual-polarized antenna manufacture, in particular to an asymmetrical dual-polarized antenna device based on a SICL resonant cavity ring gap and a printed vibrator.

Background technique:

Among the specific types of dual-polarized antennas, according to the radiation mechanism, dual-polarized antennas can be divided into dual-polarized dipole antennas, dual-polarized aperture antennas, dual-polarized slot antennas, and dual-polarized microstrip antennas. According to different feeding methods, dual-polarized antennas can be divided into coaxial-fed dual-polarized antennas, microstrip-fed dual-polarized antennas, waveguide-fed dual-polarized antennas, electromagnetic coupling-fed dual-polarized antennas, etc. . Horn antennas are widely used in microwave measurement, radar, and detection systems due to their versatility, simplicity, and good radiation performance. The ridge horn antenna has high gain, low impedance, small size, and is easy to connect with transmission lines. It is suitable for use in radar, electronic countermeasure equipment and microwave electronic devices.

Foreign satellite-borne synthetic aperture radars in orbit or under research, among which SIR-C, RadarsatII, Terra-X and ESA L-SAR all use dual-polarization solid-state active phased array antennas to achieve full-pole capability. Microstrip and waveguide slot antenna arrays have their own applications. Generally, microstrip antenna arrays are used below the C-band, while waveguide slot antennas above the C-band still have great advantages. This is determined by the characteristics of the microstrip line and waveguide transmission line. The typical one is the Canadian C-band Radarsat-I, and the follow-up model RadarsatIl changes the original centralized feed waveguide slot array into a microstrip active phased array. Germany's Terra-X antenna works in the X-band. The radiation array uses a silver-plated CFRP dual-polarization waveguide slot array with a center frequency of 9.65GHz, a bandwidth of 150MHz, and a high resolution of 300MHz. According to the calculation, for the 16-element waveguide slot array used in this scheme, the bandwidth design has reached its limit value. When the SAR system needs a wider working bandwidth, the microstrip antenna is relatively easy to implement, while the waveguide slot array requires a complex structure, which brings increased processing difficulty and cost.

In foreign countries, dual-polarized antennas have also been deeply studied and widely used. Dual-polarization research covers dual-polarized microstrip antennas, broadband and ultra-wideband dual-polarized antennas, dual-polarized dielectric resonator antennas, dual-polarized cavity-backed antennas, dual-polarized horn antennas, and dual-polarized slot Antennas, dual polarized monopole antennas and dual polarized lens antennas.

The slot antenna is slotted on the surface of the metal body. The slot must cut off the surface current of the metal wall. Part of the surface current bypasses the slot, while the other part flows through the slot in the form of displacement current along the original direction, and the force line of the displacement current will flow outward. space radiation. The slot antenna can be regarded as composed of many slot elements. The radiation principle of the slot can be illustrated by an ideal slot antenna model. The slot is equivalent to a magnon antenna, which is considered to be an antenna with a magnetic current source. Using the principle of duality, the radiation of the magnon can pass through the radiation of the magnon To compare. The slotted waveguide array antenna has excellent characteristics such as narrow main lobe width and low cross-polarization level. It is an important microwave antenna and can be widely used in radar and communication systems. However, metal waveguides are bulky, heavy, and expensive to manufacture, and need to be tuned to correct errors after processing. Transplanting the design concept of the traditional rectangular waveguide slot antenna to the substrate integrated transmission line can also form a slot antenna array, and obtain sufficient gain and small side lobe level. The slot radiator on the metal bottom surface can radiate electromagnetic energy to the upper and lower directions of the substrate at the same time. In practical applications, due to the circuit layout, the antenna often needs to be installed on a certain platform. The electromagnetic waves radiating downward may affect the performance of other components in the system, while the electromagnetic waves reflected back will also affect the antenna itself. Therefore, when the antenna is required to radiate in one direction, a metal cavity or reflective wall is usually added behind the slit to suppress the electromagnetic waves radiated downwards, thereby solving the electromagnetic compatibility problem. The cavity-backed antenna generally consists of a metal cavity and an excitation source, and the shape of the excitation source and the cavity-back in the middle can have various forms. The research on cavity-backed antennas began in the 1950s. At present, antenna units or arrays in the form of linear polarization, circular polarization, and dual polarization have been realized by using cavity-backed antennas in various microwave frequency bands. In the design of using the cavity-backed antenna to achieve circular polarization, the general situation is that the excitation source of the cavity-backed antenna forms circular polarization. The role of the cavity-backed antenna is to stabilize the pattern, suppress the back lobe radiation, and increase the antenna gain. The cavity can be regarded as a resonant cavity, and the electric field distribution in the cavity can be obtained by analyzing the eigenmodes in the cavity. However, compared with the general closed resonant cavity, the cavity antenna has unique properties, such as energy radiation, electric field disturbance in the cavity, resonance frequency shift and mode spectrum narrowing, etc.

A substrate integrated coaxial line (Substrate Integrated Coaxial Line, SICL) technology is a technology that planarizes a coaxial line in the traditional sense. Like traditional coaxial cables, SICL is a shielded, non-dispersive TEM waveguide structure. It exhibits the same characteristics as traditional coaxial cables, that is, wide bandwidth, low loss, high Q value, and small size, so it is very suitable for high-speed broadband interconnection applications. Substrate-integrated coaxial line (SICL) combines the advantages of coaxial line and planar transmission line. It can be realized by simple and cheap PCB, CMOS, MEMS and even thin-film circuits, and can be easily integrated into broadband microwave systems. The first-order high-order mode of SICL is TE ₁₀ mode, because the intermediate conductor does not affect the field characteristics of TE ₁₀ mode. The single-mode operating bandwidth of SICL can be controlled by adjusting the distance between two rows of metallized holes, which can achieve a much wider bandwidth than a planar structure similar to SIW of the same size. Research on substrate-integrated coaxial lines (SICL) is currently in its infancy. Because the inner and outer conductors of the coaxial line are distributed on different layers, and there is a dielectric layer in the middle, the inner conductor of the SICL cannot be placed on the surface layer of the PCB. Microstrips are required to be placed on the surface of the PCB in order to facilitate the testing of solder joints or plug-in instruments. Therefore, the transition from micro to SICL cannot adopt the coplanar form, but can only adopt the different planar form. In order to achieve better coupling performance, gaps or small holes can be used for coupling. It is required to form a natural transition at both ends of the gap or small holes, and there should be as few discontinuities as possible.

Invention content:

Aiming at the shortcomings and deficiencies in the prior art, the present invention proposes an asymmetrical dual-polarization antenna device based on the annular gap of the SICL resonant cavity and the printed vibrator.

The present invention can reach through the following measures:

An asymmetrical dual-polarized antenna device based on a SICL resonator ring slot and a printed vibrator, which is characterized in that it is provided with a medium-integrated coaxial resonant cavity ring-shaped radiation slot and a printed monopole, and the gap between the two is In the vertical direction, the air gap is used for isolation, and the two dual-polarized ports are realized by printed circuit technology, in which a dielectric integrated coaxial resonant cavity is used to load a circular gap to form a polarized port, and a miniaturized printed rectangular monopole antenna is used. As an orthogonal polarization port, the two polarization ports are asymmetrical, but form an orthogonal radiation field in space, which can produce a dual-polarization working mode.

In the present invention, the cavity slot antenna based on the dielectric integrated coaxial line constitutes a polarization port of the asymmetric dual-polarization antenna, and the cavity circular slot can be equivalent to a circular magnetic current radiating, in the far field area , which radiates an approximately linearly polarized electromagnetic field, which forms a polarization orthogonal relationship with the radiation field of the printed monopole antenna.

In the present invention, the printed dipole antenna is placed above the SICL resonant cavity annular slot antenna, and at the output end of the fed microstrip line of the printed monopole, in order to obtain a good output voltage standing wave ratio, a broadband gradual impedance matching end is introduced. Obtain a 50 ohm impedance at the output for easy connection to the coaxial line.

In summary, the present invention proposes a combined asymmetrical dual-polarized antenna device using a circular slot antenna grooved on the surface of a SICL resonator and a printed monopole antenna, producing two orthogonal radiation field antennas The radiators are the annular slot antenna radiator and the printed monopole antenna based on the dielectric integrated coaxial resonator cavity respectively; the antenna radiators of the two polarization ports are of different types, the feeding mode is flexible, and it is easy to realize in engineering Two-polarization port isolation and cross-polarization level adjustment, and the printed monopole antenna has a wide impedance bandwidth; the entire asymmetrical dual-polarized antenna is processed and produced by printed circuit technology, the accuracy is easy to control, and can be achieve size reduction. The dual-polarization antenna designed by the invention has simple structure and low cost. The invention is suitable for occasions such as dual-polarization radars and communication systems, and has platform adaptability and wide application fields.

Description of drawings:

Accompanying drawing 1 is the structure schematic diagram of traditional ring slot antenna.

Accompanying drawing 2 is circular gap and coordinate system thereof.

Accompanying drawing 3 is the structure diagram of rectangular microstrip dipole antenna.

Accompanying drawing 4 is a typical SICL structure diagram.

Accompanying drawing 5 is structural model of the present invention.

Figure 6 is a schematic diagram of the structure of the ring slot antenna based on the SICL resonator in the present invention.

Accompanying drawing 7 is the internal structure diagram of the cavity of the medium-integrated coaxial line in the present invention.

Accompanying drawing 8 is the structure diagram of printed monopole antenna in the present invention.

Accompanying drawing 9 is the simulation result of voltage standing wave ratio of port 1 in the embodiment of the present invention.

Accompanying drawing 10 is the simulation result of voltage standing wave ratio of port 2 in the embodiment of the present invention.

Accompanying drawing 11 is the simulation result of the isolation between ports 1 and 2 in the embodiment of the present invention.

Figure 12 is the simulation result of the radiation characteristics at the center frequency of the dual-polarized antenna based on the circular slot of the SICL cavity and the printed monopole in the embodiment of the present invention.

Figure 13 is the simulation result of the radiation characteristics at low frequencies of the dual-polarized antenna based on the circular slot of the SICL cavity and the printed monopole in the embodiment of the present invention.

Figure 14 is the simulation result of the radiation characteristics at high frequencies of the dual-polarized antenna based on the circular slot of the SICL cavity and the printed monopole in the embodiment of the present invention.

Reference numerals: 1 is the cavity of the dielectric integrated coaxial line, 2 is the ring gap of the dielectric integrated coaxial line cavity; 3 is the printed monopole antenna unit, 4 is the metal floor based on the dielectric integrated coaxial line , 5 is the metal via array of the dielectric integrated coaxial cable, 6 is the dielectric substrate of the dielectric integrated coaxial cable, 7 is the central conductor strip of the dielectric integrated coaxial cable, and 8 is the feeding position of the dielectric integrated coaxial cable cavity .

Detailed ways:

The present invention will be further described below in conjunction with the accompanying drawings.

The invention proposes an asymmetric structure dual-polarization antenna device scheme based on the combination of the circular slot of the medium-integrated coaxial resonant cavity and the printed monopole. The designed dual-polarized antenna is composed of a dielectric integrated coaxial resonant cavity circular radiation slot and a printed monopole. The air gap is used to isolate the two in the vertical direction. The two dual-polarized ports are connected by Printed circuit technology implementation. A new type of medium-integrated coaxial resonant cavity is used to load the annular gap to form a polarization port, and a miniaturized printed rectangular monopole antenna is used as the orthogonal polarization port. The two polarization ports are asymmetrical. But they form an orthogonal radiation field in space, which can produce a dual-polarized working mode. The radiation mechanisms of the two polarized ports of the dual-polarized antenna designed by the present invention are different, and they are all conveniently designed into a miniaturized mode, which is convenient to form a miniaturized dual-polarized unit, and reduces the design difficulty of the dual-polarized antenna; The monopole antenna adopts a printed structure, and the metal radiator does not have a great influence on the SICL circular gap. Reasonable control of the position and structural parameters between the two polarized ports can realize the isolation between the two polarized single ports Degree of control to achieve the expected cross-polarization level; because the dual-polarization antenna unit can be miniaturized, the antenna is suitable for forming arrays such as phased array antenna arrays and MIMO arrays. In the present invention, the asymmetric structure dual-polarization antenna device based on the combination of the medium-integrated coaxial resonant cavity circular gap and the printed monopole is suitable for use in systems such as radar, communication, and navigation, as a dual-polarization antenna sensor The device has more important practical application value.

The present invention designs an asymmetric structure dual-polarization antenna device based on the combination of a medium-integrated coaxial resonant cavity circular gap and a printed monopole. The antenna device introduces a dual-polarization antenna design scheme with an asymmetric port structure , the basic idea is to design a dual-polarized antenna device based on a printed circuit structure. The two polarized ports use different types of antenna radiators. Their radiation mechanisms are different, and each forms a polarized electromagnetic field in the far-field space. structure, the electromagnetic field polarizations generated by the two are orthogonal to each other, realize the orthogonal dual polarization channel, can radiate and sense the two orthogonal polarization components of the electromagnetic wave, and provide a good orthogonal polarization base for the fully polarized electronic system. In the present invention, a polarized port is a ring slot antenna radiator, which can be approximately equivalent to the radiation of a circular magnetic current; another polarized port is a printed monopole radiator, which can be regarded as the current source Radiation, therefore, the two belong to different types of antenna radiators, and their radiation fields in the far zone are different, and the power pattern of the radiation field will be slightly different, but they meet the orthogonal requirements of the electromagnetic field in the main radiation direction; The present invention adopts an asymmetric scheme to design a dual-polarized antenna, and the two polarized radiators have an air gap in the vertical direction to control the distance between the two polarized ports and optimize the geometric structure of the two polarized radiators at the same time parameters, which can achieve the required polarization port isolation and the cross-polarization level of a single polarized radiator; the design of the asymmetric dual-polarized antenna is simplified compared with the traditional symmetrical dual-polarized design process, and the structural design is more flexible. Design controllability is enhanced.

The asymmetric dual-polarized antenna designed by the present invention is composed of a dielectric integrated coaxial resonator cavity circular slot antenna and a printed monopole antenna. The two polarized radiators are different types of antennas, but they both use Printed circuit technology is realized, all of which are planar structures. Both the dielectric-integrated coaxial resonator cavity circular slot antenna and the printed monopole antenna can be miniaturized to form a combined dual-polarization unit, which can be used in dual-polarization antenna arrays and other occasions.

The cavity-backed antenna generally consists of a metal cavity and an excitation source, and the shape of the excitation source and the cavity-back in the middle can have various forms. At present, antenna units or arrays in the form of linear polarization, circular polarization, and dual polarization have been realized by using cavity-backed antennas in various microwave frequency bands. The role of the back cavity is to stabilize the pattern, suppress the back lobe radiation, and increase the antenna gain. With the rapid development of wireless communication, communication systems have higher and higher requirements for antennas. The slot antenna has the advantages of simple structure and high radiation efficiency. Compared with ordinary microstrip patch antennas, slot antennas have wider impedance bandwidth and axial ratio bandwidth, and small manufacturing errors are not very sensitive to performance effects. The important thing is that they are easy to integrate with wireless communication system terminals. The electromagnetic radiation field of the circular slot antenna conforms to Babbitt's complementarity principle, which can effectively reduce the total size of the antenna. Circularly polarized antennas have the characteristics of reducing multipath effects and can transmit signals in a full plane, while linearly polarized antennas can only transmit in one plane. In order to improve communication quality, circularly polarized antennas have been widely used in wireless communication, radar systems, and navigation systems. The traditional annular slot antenna is to etch a mesh annular slot on the ground surface of the dielectric substrate, and feed it with a 50 ohm open-circuit microstrip line on the other side of the substrate. The structure is shown in Figure 1, where the radius of the annular slot determines the resonant frequency of the antenna , the best match can be obtained by adjusting the relative position between the end of the microstrip line and the center of the annular seam and the width of the annular seam. The ring gap and its coordinate system are shown in Fig. 2. Theoretically, the annular gap on the infinite conductive plate can be regarded as the annular distribution of the surface magnetic current, which can be expressed as

In the formula: E _a is the electric field of the orifice; n is the unit vector perpendicular to the orifice. The far-field pattern of the annular slot antenna is calculated by the electric vector potential method. Assuming that the ground plane is infinite, and the influence of the edge diffraction field is not considered, the E _θ and E _φ components of the far-field electric field can be obtained in two cases respectively . Narrow slot situation I: ω<<ω ₀ , and E _φ'=0 , E _ρ ＝E ₀ =constant, then:

Approximately solving the field distribution in the gap is equivalent to solving the field distribution of the annular uniformly distributed magnetic flow elements.

Narrow slot situation II: that is, ω<<ω ₀ , and E _φ'=0 , E _ρ =E ₀ ·cosnφ', then:

It can be seen from equations (4) and (5) that when ak ₀ =1, the annular slot antenna works in the fundamental mode state. At this time, the gain of the antenna is the largest in the direction perpendicular to the plane where the annular slot is located, that is, the antenna direction The main lobe of the figure points to this direction. As the mode increases, the surface wave and high-order mode excitation of the antenna will seriously affect the axial ratio of the antenna. To obtain a good axial ratio, the antenna is required to work in a low-order mode during design and schema status.

Dipole antenna is the most basic form of antenna, which has omnidirectional radiation characteristics, and is widely used in various wireless communication tether cables because of its simple structure and low cost. At present, many technologies for widening the dipole frequency band have been developed, and many new dipole antennas have been formed, such as biconical antennas, double dipole antennas, and bow-tie antennas. The planar dipole antenna uses the dipole structure printed on the dielectric substrate as the radiation unit of the antenna, and excites the antenna unit to radiate through balun feeding or coupling feeding. Because the printed circuit board has the advantages of free structural design, easy processing and assembly, low cost and light weight, many base station antennas use planar dipole antennas printed on FR-4 dielectric substrates as array elements. The traditional dipole antenna can be intuitively understood as being formed by the external radiation of the field bound between the transmission lines as the ends of the transmission lines change from parallel to collinear, and the same is true for the microstrip dipole antenna. Microstrip dipole antennas can be divided into monopoles and dipoles. The microstrip monopole antenna is to add metal sheets on both sides or the same side of the dielectric substrate as the ground plane and the radiation oscillator. The difference from the microstrip patch antenna is that the ground plane of the microstrip monopole antenna does not appear in the radiation Directly below the pole, and usually at a certain distance from the radiating monopole, the microstrip monopole antenna uses an unbalanced feed. The microstrip dipole antenna is to add metal sheets symmetrically on both sides or the same side of the dielectric substrate as the two arms of the radiation oscillator. Balanced feeding is required, so an unbalanced to balanced circuit is required between the microstrip line and the dipole. The conversion device is a balun. Due to the non-resonant structure, the bandwidth of the microstrip dipole antenna is relatively large; at the same time, because the dielectric substrate mainly plays a supporting role for the microstrip dipole antenna, its dielectric constant and thickness can be small, and the dielectric loss and surface wave loss are relatively small. Low, the efficiency of the microstrip dipole antenna is relatively high. A structural schematic diagram of a rectangular microstrip dipole antenna is shown in FIG. 4 .

Substrate Integrated Coaxial Line (Substrate Integrated Coaxial Line, SICL) is a new type of planar transmission line, which is similar in structure to traditional coaxial lines, with low loss, small radiation, small mutual coupling between circuits, and small It has many advantages such as small size and non-dispersion, especially it can be processed by traditional PCB and LTCC technology, and has obvious advantages in mass production. Using SCIL as a microwave transmission line can provide solutions for designing many new microwave antennas and devices. Based on the coaxial resonant cavity theory, slots can be formed on the surface of SICL for radiation, which provides a technical solution for designing slot antennas. SICL is mainly composed of a bottom conductor (ground), an inner conductor (middle), a top conductor, side walls on both sides (or metal holes), and two dielectric layers. The bottom conductor, side walls on both sides and the top conductor together constitute the SICL. outer conductor. A typical SICL structure is shown in Figure 1. Under certain assumptions, the cutoff frequency of SICL in TE ₁₀ mode is:

In the formula, A, D, S are shown in Figure 4, and c is the speed of light in vacuum. Since D and S are generally limited by the board manufacturing process, the cutoff frequency of SICL in TE ₁₀ mode is the single-mode bandwidth of SICL, which can be adjusted by the distance A of the metal holes on both sides.

Based on SICL, the present invention proposes a combined asymmetrical dual-polarized antenna scheme using a circular slot antenna slotted on the surface of the SICL resonator and a printed monopole antenna, and the design is based on a medium-integrated coaxial cavity The geometric structure model of the asymmetric dual-polarized antenna combined with the annular slot antenna and the printed monopole antenna is shown in Figure 5. In Figure 5, 1 is the cavity of the dielectric-integrated coaxial line, and 2 is the dielectric-integrated coaxial cavity. The ring gap of the coaxial cavity; 3 is the printed monopole antenna unit part. The coaxial line is a fully enclosed structure and non-dispersive. Because it is not easy to integrate with planar circuits, it is difficult to use it in microwave and millimeter wave circuits. As a coaxial cable with a planar structure, SICL has the performance similar to that of a traditional coaxial cable, and at the same time can realize the characteristics of a planar transmission line. SICL is a multi-layer PCB, including upper and lower conductor plates, inner conductors, metallized via arrays and dielectrics. Figure 6 shows the circular slot antenna model based on the SICL resonator. In Figure 6, 4 is the metal floor based on the dielectric integrated coaxial line, and 5 is the metal via array of the dielectric integrated coaxial line. Figure 7 shows the internal structure of the cavity of the dielectric integrated coaxial cable. In FIG. 7, 6 is the dielectric substrate of the dielectric integrated coaxial cable, 7 is the central conductor strip of the dielectric integrated coaxial cable, and 8 is the Axis cavity feed position. The cavity slot antenna based on the dielectric integrated coaxial line constitutes a polarization port of the asymmetric dual-polarized antenna. The cavity circular slot can be equivalent to a circular magnetic current radiating. In the far field region, it radiates An approximately linearly polarized electromagnetic field forms a polarization orthogonal relationship with the radiation field of the printed monopole antenna. In order to achieve high radiation efficiency and a single working mode of the antenna, the length, width, slot length, position and slot width of the cavity need to be optimized using full-wave electromagnetic simulation technology under the condition of selecting a dielectric substrate. The printed monopole adopts a rectangular structure, which is fed by a microstrip line and an impedance transformation section; the printed dipole antenna is placed above the SICL resonant cavity annular slot antenna, and through reasonable design and structural optimization, it meets the requirements of their respective impedance matching. Under these conditions, the expected port isolation performance and cross-polarization levels can be achieved. At the output end of the fed microstrip line of the printed monopole, in order to obtain a good output voltage standing wave ratio, a broadband gradual impedance matching end is introduced, and an impedance of 50 ohms is obtained at the output end to facilitate connection with the coaxial line. Figure 8 is a schematic diagram of the structure of a printed monopole antenna.

Example:

The present invention designs a specific asymmetrical dual-polarized antenna device using a circular slot antenna slotted on the surface of a SICL resonator and a printed monopole antenna. Simulation, simulation experiment results verify the feasibility and effectiveness of the asymmetric dual-polarized antenna device proposed by the present invention, which adopts the combined circular slot antenna with grooved surface of SICL resonator and printed monopole antenna.

The simulation results of the voltage standing wave ratio (VSWR) of port 1 and port 2 of the dual-polarized antenna designed in the present invention are shown in Fig. 9 and Fig. 10 respectively. The isolation between port 1 and port 2 is shown in Figure 11. Within the working bandwidth, the voltage standing wave ratio of port 1 and port 2 is about 2, and the port isolation is greater than 20dB.

At the center frequency, the simulation results of the radiation pattern characteristics of the dual-polarized antenna are shown in Figure 12. On the two polarization ports, the radiation gains of the designed dual-polarized antenna based on the SICL cavity ring slot and the printed monopole are about 6.3dB and 7.5dB, respectively, the axial ratio of the main radiation direction is greater than 40dB, and the cross-polarization The level meets the requirements. For polarization port 1, the beamwidths of the designed dual-polarized antenna based on SICL cavity ring slot and printed monopole are about 73.6 degrees and 88.7 degrees in the xoy plane and yoz plane, respectively; for polarization port 2, The beamwidths of the designed dual-polarized antenna based on SICL cavity ring slot and printed monopole are about 65 degrees and 99.9 degrees in the xoy plane and yoz plane, respectively.

At the low frequency f1, the simulation results of the radiation pattern characteristics of the dual _- polarized antenna are shown in Figure 13. On the two polarization ports, the radiation gains of the designed dual-polarized antenna based on the SICL cavity ring slot and the printed monopole are about 6.1dB and 7.8dB, respectively, the axial ratio of the main radiation direction is greater than 40dB, and the cross-polarization The level meets the requirements. For polarization port 1, the beamwidths of the designed dual-polarized antenna based on SICL cavity ring slot and printed monopole are about 73.83 degrees and 88.46 degrees in the xoy plane and yoz plane, respectively; for polarization port 2, The beamwidths of the designed dual-polarized antenna based on SICL cavity ring slot and printed monopole are about 63.6 degrees and 99.2 degrees in the xoy plane and yoz plane, respectively.

At the low frequency f2, the simulation results of the radiation pattern characteristics of the _dual -polarized antenna are shown in Figure 14. On the two polarization ports, the radiation gains of the designed dual-polarized antenna based on the SICL cavity ring slot and the printed monopole are about 6.4dB and 7.9dB, respectively, the axial ratio of the main radiation direction is greater than 40dB, and the cross-polarization The level meets the requirements. For polarization port 1, the beamwidths of the designed dual-polarized antenna based on SICL cavity ring slot and printed monopole are about 73.46 degrees and 87.6 degrees in the xoy plane and yoz plane, respectively; for polarization port 2, The beamwidths of the designed dual-polarized antenna based on SICL cavity ring slot and printed monopole are about 62.2 degrees and 99.4 degrees in the xoy plane and yoz plane, respectively.

In summary, the present invention proposes a combined asymmetrical dual-polarized antenna device using a circular slot antenna grooved on the surface of a SICL resonator and a printed monopole antenna, producing two orthogonal radiation field antennas The radiators are the annular slot antenna radiator and the printed monopole antenna based on the dielectric integrated coaxial resonator cavity respectively; the antenna radiators of the two polarization ports are of different types, the feeding mode is flexible, and it is easy to realize in engineering Two-polarization port isolation and cross-polarization level adjustment, and the printed monopole antenna has a wide impedance bandwidth; the entire asymmetrical dual-polarized antenna is processed and produced by printed circuit technology, the accuracy is easy to control, and can be achieve size reduction. The dual-polarization antenna designed by the invention has simple structure and low cost. The invention is suitable for occasions such as dual-polarization radars and communication systems, and has platform adaptability and wide application fields.

Claims (3)

1. An asymmetric dual-polarized antenna device based on SICL resonant cavity circular ring gap and printed oscillator is characterized in that a medium integrated coaxial resonant cavity circular ring radiation gap and a printed monopole are arranged, an air gap is adopted for isolation in the vertical direction between the two circular ring radiation gaps, two dual-polarized ports are realized by printed circuit technology, wherein the medium integrated coaxial resonant cavity loading circular ring gap is adopted to form a polarized port, a miniaturized printed rectangular monopole antenna is adopted as a polarized port orthogonal to the polarized port, the two polarized ports are asymmetric, but an orthogonal radiation field is formed in the space, and a dual-polarized working mode can be generated.

2. The asymmetric dual-polarized antenna device based on the SICL resonant cavity circular ring slot and the printed vibrator according to claim 1, characterized in that the cavity slot antenna based on the dielectric integrated coaxial line forms a polarized port of the asymmetric dual-polarized antenna, the cavity circular ring slot can be equivalently an annular magnetic current to be radiated, in the far field region, it radiates an electromagnetic field with approximate linear polarization, and the radiation field of the printed monopole antenna just forms a polarization orthogonal relationship.

3. The asymmetric dual-polarized antenna device based on the SICL resonant cavity circular ring slot and the printed oscillator as claimed in claim 1, wherein the printed oscillator antenna is placed above the SICL resonant cavity circular slot antenna, and at the output end of the feed microstrip line of the printed monopole, in order to obtain a good output voltage standing wave ratio, a broadband gradual change type impedance matching end is introduced, and at the output end, 50 ohm impedance is obtained, so as to facilitate connection with the coaxial line.

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